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| Experimental study on grouting reduction of overburden rock in super high water material |
| Liu Ruifeng1， Cui Jingkun2， Deng fan1， Wei cai1， Ma jun1 |
| 1.College of Resource and Environmental Engineering, Yibin University，Yibin 644007，China；2. College of Resources, Hebei University of Engineering, Handan 056000, China |
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Abstract The overlying strata and stope model with 1∶200 similarity ratio was established by simulation experiment technology, the theoretical analysis of the strata movement after mining coal seam was conducted based on the rock layer theory, the overlying strata under the key strata has separations and affects the surface deformation with time increasing after the coal mining working face being advanced of 120 m. The similar model from the ground to the overlying rock drilled grouting and the main separation space was established, the fracture of separated layer was filled by taking high water material advantages of good liquidity, adjustable solidification time and incompressible feature under three-dimensional stress, controlling surface subsidence by mining. Considering the grouting requirements of liquidity strength and solidification time of the high water material, the water cement ratio of the filling materials was settled as 1∶12.
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